Apr 27, 4977 BC:
Universe is created, according to Kepler - On this day in 4977 B.C., the universe is created, according to German mathematician and astronomer Johannes Kepler, considered a founder of modern science. Kepler is best known for his theories explaining the motion of planets.

Kepler was born on December 27, 1571, in Weil der Stadt, Germany. As a university student, he studied the Polish astronomer Nicolaus Copernicus' theories of planetary ordering. Copernicus (1473-1543) believed that the sun, not the earth, was the center of the solar system, a theory that contradicted the prevailing view of the era that the sun revolved around the earth.

In 1600, Kepler went to Prague to work for Danish astronomer Tycho Brahe, the imperial mathematician to Rudolf II, emperor of the Holy Roman Empire. Kepler's main project was to investigate the orbit of Mars. When Brahe died the following year, Kepler took over his job and inherited Brahe's extensive collection of astronomy data, which had been painstakingly observed by the naked eye. Over the next decade, Kepler learned about the work of Italian physicist and astronomer Galileo Galilei (1564-1642), who had invented a telescope with which he discovered lunar mountains and craters, the largest four satellites of Jupiter and the phases of Venus, among other things. Kepler corresponded with Galileo and eventually obtained a telescope of his own and improved upon the design. In 1609, Kepler published the first two of his three laws of planetary motion, which held that planets move around the sun in ellipses, not circles (as had been widely believed up to that time), and that planets speed up as they approach the sun and slow down as they move away. In 1619, he produced his third law, which used mathematic principles to relate the time a planet takes to orbit the sun to the average distance of the planet from the sun.

Kepler's research was slow to gain widespread traction during his lifetime, but it later served as a key influence on the English mathematician Sir Isaac Newton (1643-1727) and his law of gravitational force. Additionally, Kepler did important work in the fields of optics, including demonstrating how the human eye works, and math. He died on November 15, 1630, in Regensberg, Germany. As for Kepler's calculation about the universe's birthday, scientists in the 20th century developed the Big Bang theory, which showed that his calculations were off by about 13.7 billion years.


Apr 27, 1521:
Magellan killed in the Phillipines - After traveling three-quarters of the way around the globe, Portuguese navigator Ferdinand Magellan is killed during a tribal skirmish on Mactan Island in the Philippines. Earlier in the month, his ships had dropped anchor at the Philippine island of Cebu, and Magellan met with the local chief, who after converting to Christianity persuaded the Europeans to assist him in conquering a rival tribe on the neighboring island of Mactan. In the subsequent fighting, Magellan was hit by a poisoned arrow and left to die by his retreating comrades.

Magellan, a Portuguese noble, fought for his country against the Muslim domination of the Indian Ocean and Morocco. He participated in a number of key battles and in 1514 asked Portugal's King Manuel for an increase in his pension. The king refused, having heard unfounded rumors of improper conduct on Magellan's part after a siege in Morocco. In 1516, Magellan again made the request and the king again refused, so Magellan went to Spain in 1517 to offer his services to King Charles I, later Holy Roman Emperor Charles V.

In 1494, Portugal and Spain, at the prompting of Pope Alexander VI, settled disputes over newly discovered lands in America and elsewhere by dividing the world into two spheres of influence. A line of demarcation was agreed to in the Atlantic Ocean--all new discoveries west of the line were to be Spanish, and all to the east Portuguese. Thus, South and Central America became dominated by the Spanish, with the exception of Brazil, which was discovered by the Portuguese explorer Pedro Alvares Cabral in 1500 and was somewhat east of the demarcation line. Other Portuguese discoveries in the early 16th century, such as the Moluccas Islands--the Spice Islands of Indonesia--made the Spanish jealous.

To King Charles, Magellan proposed sailing west, finding a strait through the Americas, and then continuing west to the Moluccas, which would prove that the Spice Islands lay west of the demarcation line and thus in the Spanish sphere. Magellan knew that the world was round but underestimated its size, thinking that the Moluccas must be situated just west of the American continent, not on the other side of a great uncharted ocean. The king accepted the plan, and on September 20, 1519, Magellan set sail from Spain in command of five ships and 270 men.

Magellan sailed to West Africa and then to Brazil, where he searched the South American coast for a strait that would take him to the Pacific. He searched the Rio de la Plata, a large estuary south of Brazil, for a way through; failing, he continued south along the coast of Patagonia. At the end of March 1520, the expedition set up winter quarter at Port St. Julian. On Easter day at midnight, the Spanish captains mutinied against their Portuguese captain, but Magellan crushed the revolt, executing one of the captains and leaving another ashore when his ship left St. Julian in August.

On October 21, he finally discovered the strait he had been seeking. The Strait of Magellan, as it became known, is located near the tip of South America, separating Tierra del Fuego and the continental mainland. Only three ships entered the passage; one had been wrecked and another deserted. It took 38 days to navigate the treacherous strait, and when ocean was sighted at the other end Magellan wept with joy. He was the first European explorer to reach the Pacific Ocean from the Atlantic. His fleet accomplished the westward crossing of the ocean in 99 days, crossing waters so strangely calm that the ocean was named "Pacific," from the Latin word pacificus, meaning "tranquil." By the end, the men were out of food and chewed the leather parts of their gear to keep themselves alive. On March 6, 1521, the expedition landed at the island of Guam. Ten days later, they reached the Philippines--they were only about 400 miles from the Spice Islands.

After Magellan's death, the survivors, in two ships, sailed on to the Moluccas and loaded the hulls with spice. One ship attempted, unsuccessfully, to return across the Pacific. The other ship, the Victoria, continued west under the command of the Basque navigator Juan Sebastian de Elcano. The vessel sailed across the Indian Ocean, rounded the Cape of Good Hope, and arrived at Seville on September 9, 1522, becoming the first ship to circumnavigate the globe.


Apr 27, 1773:
Parliament passes the Tea Act - On this day in 1773, the British Parliament passes the Tea Act, a bill designed to save the faltering East India Company from bankruptcy by greatly lowering the tea tax it paid to the British government and, thus, granting it a de facto monopoly on the American tea trade. Because all legal tea entered the colonies through England, allowing the East India Company to pay lower taxes in Britain also allowed it to sell tea more cheaply in the colonies. Even untaxed Dutch tea, which entered the colonies illegally through smuggling, was more expensive the East India tea, after the act took effect.

British Prime Minister, Frederick, Lord North, who initiated the legislation, thought it impossible that the colonists would protest cheap tea; he was wrong. Many colonists viewed the act as yet another example of taxation tyranny, precisely because it left an earlier duty on tea entering the colonies in place, while removing the duty on tea entering England.

When three tea ships carrying East India Company tea, the Dartmouth, the Eleanor and the Beaver, arrived in Boston Harbor, the colonists demanded that the tea be returned to England. After Massachusetts Governor Thomas Hutchinson refused to send back the cargo, Patriot leader Samuel Adams organized the so-called Boston Tea Party with about 60 members of the radically anti-British Sons of Liberty. On December 16, 1773, the Patriots boarded the British ships disguised as Mohawk Indians and dumped the tea chests, valued then at £18,000 (nearly $1 million in today's money), into the water.

Parliament, outraged by the Boston Tea Party and other blatant acts of destruction of British property, enacted the Coercive Acts, known to colonists as the Intolerable Acts, the following year. The Coercive Acts closed Boston to merchant shipping, established formal British military rule in Massachusetts, made British officials immune to criminal prosecution in America and required colonists to quarter British troops. The colonists subsequently called the first Continental Congress to consider a united American resistance to what they saw as British oppression.